Wouldn’t think so, but it would be the crime of the century if declined I reckon. They picking up an extra match fee so would imagine players are keen on that if not playing for their state
But they can say no, right?
I feel that any complaints about scheduling are stupid as
1) you actually don't know what players are being picked for origin year to year.
2) if the players prioritise origin over club footy, that's not really anyones problem other than the club and the player.
3)if clubs can talk players out of indigenous/country representation, with the intent of benefitting the club, they can do the same in this situation.